Improvement in locks for doors



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JOHN THEOPHILUS ILLIAIWIS, OF CHICAGO, ILLINOIS.

IMPROVEMENT IN` LOCKS FOR DOORS,"&C.

Specification forming part of Letters Patent No. 116,907, dated July l1,1871.

' nexed drawing making' a part of this speciiication, in which- Figure lis a perspective view of the lock inserted in the edge of a door ordrawer, with a section of the wood cutaway to show the attachment ofkeyhole escutcheon to lock; Fig. 2, a longitudinal elevation, Fig. 3, avertical longitudinal section 5 Fig. 4, a horizontal longitudinalsection and elevation. Fig. 5 is a detailed view of the bolt-rack; Fig.6, the key; Fig. 7, a trans verse section of Fig. 2 at x; Fig. 8, an endview of Fig. 2; Fig. 9, atransverse elevation of keyhole escutcheon;Fig. l0, a longitudinal eleva` tion of key-hole escutcheon.

To enable others skilled in the art to make and use my invention, I willproceed to describe its construction and operation.

I construct my lock-case and bolt of two hollow cylinders, of brass orother meta-l, one sliding easily into the other, and prevented fromturning therein by the screw g working in slot L', Fig. 4. The smallertube, when plugged at one end, serves as a bolt, and is shown at Fig. 2at B. Inserted securely in the plug ofthe bolt are four tumbler-wires,shown at w zo, Fig. 3, extending backwardnearlyparallel with the axis ofthe tube as far as the plate D. At right angles to the axis of thetubular case is a screw inserted, extending from side to side, (shown ats, Figs. 2 and 4.) On the screw is fixed a pinion, shown at o, Figs. 3and 7. This screw is slotted in the direction of its axis, so as to benearly cut in halves and turned away at z z, Fig. 4, so as to allow thewires 'w flo to approach each other, as shown in Figs. 4 and 7. Workingin said pinion is a rack, It, Figs. 3, 4, and 5. This rack moves thebolt by means of its head H in slot m, Fig. 4. At the rear end of thecase (shown at D, Fig. 2) is a plate pierced with four holes, n, asshown at Fig. 8. The key is formed of thin sheet-steel or other metal,as shown in profile at Fig. 6. y y y y are the notches that guide thewires to the holes yu In n n in D, Fig. S.

In order to explain the action of the lock we will suppose, Fig. 2, thelock put together, and inserted in the edge of a door or drawer, asshown at Fig. l; the key inserted in the slot d in screw s and turned tothe left. The pinion o draws the rack It and the cross-head H moves inthe slot m until the pinion has made one-fourth. of a revolution and theWires w w are lying in the notches y y, Fig. 7. Now the cross-headbegins to move the bolt B and wires w w, and the notches y y in the keywill guide the wires fw w through the holes n n and the bolt will bewithdrawn. The lock is inserted in a door or drawer by boring a hole inthe edge of said door or drawer justlarge enough to receive the casing,countersinking for the iiange. G, another hole, is bored at right anglesto this, at the right distance from the edge for the key-hole, and largeenough to admit the tube N of key-hole escutcheon. The pin j' of saidescutcheon goes into a hole in the lock, shown at fu, Figs. l and 2.This serves to keep the lock in place.

I claim- The plate D, provided with the holes n and the tumbler-wires wcapable of being moved in all directions, in combination with the piniono, rack R, bolt B, and key, substantially as and for the purpose setforth.

J. T. WILLIAMS.

Witnesses:

GEO. HoLToN, E. A. GUILBERT, Jr.,

